Google Photos delete script - Use at own risk!

grm.js

async function gPhotosPurge(nSelectedLast = -1) {
  gPhotosPurgeSelectPhotos();
  const nSelected = await gPhotosPurgeWaitFor(gPhotosPurgeGetNumberOfSelected, 'nSelected>0', 2000);
  return nSelected > 200 || nSelected == nSelectedLast ? gPhotosPurgeExecute(nSelected) : nSelected ? gPhotosPurge(nSelected) : console.info('[gPhotosPurge] nSelected=0');
}

async function gPhotosPurgeExecute(nSelected) {
  console.info('[gPhotosPurge] Deleting ' + nSelected + ' photos...');
  deleteBtn = await gPhotosPurgeWaitFor(() => document.querySelector('button[title="Delete"]'), 'deleteBtn');
  deleteBtn.focus();
  deleteBtn.click();

  confirmBtn = await gPhotosPurgeWaitFor(() => {
    const els = document.querySelectorAll('button');
    for (let i = 0; i < els.length; i++) {
      if (els[i].textContent.match(/Move to trash/)) return els[i];
    }
    return null;
  }, 'confirmBtn');

  if (!confirmBtn) return console.info('[gPhotosPurge] No confirm button.');
  confirmBtn.click();

  await gPhotosPurgeWaitFor(() => {
    return gPhotosPurgeGetNumberOfSelected() ? true : null;
  }, 'nSelected=0', 20000);

  setTimeout(gPhotosPurge, 4000);
}

function gPhotosPurgeSelectPhotos() {
  ['Burst photo', 'Collage ', 'Effects ', 'Photo ', 'Video '].forEach(label => {
    const els = document.querySelectorAll('[aria-label*="' + label + '"][role="checkbox"]');
    for (let i = 0; i < els.length; i++) {
      if (els[i].getAttribute('aria-checked') != 'false') continue;
      els[i].focus();
      els[i].click();
    }
  });
}

function gPhotosPurgeGetNumberOfSelected() {
  let clearEl = document.querySelector('[aria-label="Clear selection"]');
  while (clearEl && (clearEl = clearEl.parentNode)) {
    const selectedText = (clearEl.textContent || '').match(/(\d+)\s*selected/i);
    if (selectedText) return parseInt(selectedText[1], 10);
  }

  return null;
}

function gPhotosPurgeWaitFor(cb, desc, timeout = 5000) {
  let guard = timeout / 250;
  return new Promise((resolve, reject) => {
    const tid = setInterval(() => {
      try {
        if (!guard--) throw 'Waitfor timeout! ' + desc;
        const res = cb();
        if (res !== null) return [clearInterval(tid), resolve(res)];
      } catch (err) {
        clearInterval(tid);
        reject(err);
      }
    }, 200);
  });
}

gPhotosPurge();